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E COPYRIGHT 2013 Rolls--Royce Corporation (unpublished)

ENGINE -- 2ND STAGE HIGH PRESSURE TURBINE WHEEL LIFE LIMIT

DECREASE

1. PLANNING INFORMATION

A. Effectivity

(1) Engines

All AE 3007C and AE 3007C1 engines with a 2nd stage high pressure turbine wheel

(23084520 or 23088818) with the affected serial numbers. (See Tables)

(2) Spares

All 2nd stage high pressure turbine wheel (23084520 or 23088818) with the affected serial

numbers. (See Tables)

B. Reason

Fluorescent Penetrant Inspection results show pitting in the bore of Udimet--720 1st and

2nd--stage high pressure turbine (HPT1 and HPT2) wheels. Investigation shows that the

cleaning process of wheels during 2007 thru 2010 can be the cause of pitting. Pitting in the bore

of the HPT1 and HPT2 wheel can reduce the safe life of the component in service.

A recent analysis of the HPT1 and HPT2 wheels coupled with cyclic testing resulted in a lower

life than the current Chapter 5 life limit. A risk assessment was completed and requires a

Chapter 5 life reduction as well as a mandatory Eddy Current inspection of the possibly affected

HPT1 and HPT2 wheels when the engine goes to an Authorized Maintenance Center for

service.

C. Description

The declared engine cycle life limit (ECLL) (Ref. 05--10--00, MM) for the 2nd Stage High

Pressure Turbine wheels that were permanganate cleaned has been reduced. Chapter 5 of the

maintenance manual will be revised to show the ECLL changes.

It is mandatory that these parts be replaced upon expiration of the operating time. The operator

must record both hours and cycles of engine use in the appropriate section of the life limited

parts record of the engine logbook.

NOTE: The ECLL for life limited components located in the upper right corner of the engine

logbook has been deleted. Always reference 05--01--00 in the maintenance manual for

current engine cycle life limit information.

You must include these mandatory limits in your own approved maintenance schedule, if

applicable.

NOTE: The life limit of a given part must be limited to the lowest Cycle Life Limit based upon

all engine models in which the given part has operated. The entire engine model

history of a part must be considered when determining the part life limit.

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2ND--STAGE GAS GENERATOR--TURBINE OR HIGH--PRESSURE--TURBINE WHEEL LIFE LIMITS

PART

NUMBER CURRENT UPDATED ENGINE MODEL

Declared Life Limit (Flight Cycles)

23084520 20,000 20,000

14,800 (Note 1) AE 3007C, C1

23088818 20,000 20,000

14,800 (Note 2) AE 3007C, C1

NOTE 1: Certain 2nd Stage High Pressure Turbine wheel serial numbers that were

permanganate cleaned. See Table 1.

NOTE 2: Certain 2nd Stage High Pressure Turbine wheel serial numbers that were

permanganate cleaned. See Table 2.

TABLE 1

HPT2 P/N 23084520

Serial Numbers that were Permanganate Cleaned and have a Reduced Cyclic Life Limit

P/N 23084520

Affected Serial Numbers

All Serial Numbers with prefix XP

MW50462 thru MW63395*

*The following Serial Numbers are excluded

MW51936 MW51946 MW51947 MW51948

MW51951 MW51953 MW51954 MW51955

MW51956 MW51958 MW51959 MW51960

MW51961 MW51962 MW51971 MW51973

MW51974 MW51980 MW51989 MW53634

MW53638 MW53641 MW53647 MW53924

MW56076 MW61025
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TABLE 2

HPT2 P/N 23088818

Serial Numbers that were Permanganate Cleaned and have a Reduced Cyclic Life Limit

P/N 23088818

Affected Serial Numbers

MW63177 MW63179 MW63185 MW63186 MW63205 MW63206

MW63262 MW63264 MW63266 MW63270 MW63273 MW63274

MW63277 MW63278 MW63279 MW63280 MW63282 MW63283

MW63286 MW63289 MW63290 MW63291 MW63302 MW63303

MW63331 MW63336 MW63337 MW63340 MW63341 MW63342

MW63345 MW63348 MW63349 MW63356 MW63358 MW63382

MW63383 MW63384 MW63386 MW63389 MW63390 MW63393

MW63396 MW63397 MW63398 MW63400 MW63401 MW63408

MW63410 MW63411 MW63412 MW63413 MW63414 MW63415

MW63418 MW63422 MW63425 MW63430 MW63432 MW63433

MW63442 MW63444 MW63445 MW63446 MW63447 MW63448

MW63453 MW63456 MW63457 MW63459 MW63461 MW63462

MW63463 MW63465 MW64134 MW64136 MW64138 MW64141

MW64143 MW64153 MW64159 MW64161 MW64164 MW64165

MW64167 MW64171 MW64177 MW64179 MW64180 MW64192

MW64193 MW64196 MW64197 MW64198 MW64204 MW64205

MW64206 MW64208 MW64211 MW64212 MW64214 MW64218

MW64219 MW64220 MW64221 MW64223 MW64225 MW64226

MW64235 MW64239 MW64244 MW64245 MW64249 MW64251

MW64252 MW64257 MW64258 MW64265 MW64267 MW64271

MW64273 MW64276 MW64277 MW64301 MW64303 MW64314

MW64317 MW64325 MW64350 MW64354 MW64366 MW64367

MW64368 MW64371 MW64372 MW64381 MW64383 MW64394

MW64408 MW64412 MW64418 MW64438 MW64441 MW64459

MW64460 MW64462 MW64467 MW64471 MW64473 MW64474

MW64476 MW64477 MW64481 MW64483 MW64484 MW64490

MW64491 MW64494 MW64498 MW64502 MW64523 MW64525

MW64528 MW64534 MW64541 MW64603 MW64630 MW64638

MW64644 MW65121
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D. Approval

Technical aspects are FAA approved.

E. Manpower

In Service -- Not applicable.

Engine Removed -- Not applicable.

F. Compliance

Mandatory. This service bulletin is related to a pending FAA Airworthiness Directive (AD), which

will mandate a life reduction for the affected components.

G. Interchangeability -- Not affected

H. Material Availability -- Not applicable.

I. Tooling -- Not applicable

J. Weight and Balance -- Not affected

K. Electrical Load Data -- Not affected

L. References

(1) Advance Engineering Memorandum (AEM), CN500016456037.

NOTE: The document above is referenced for the internal use of Rolls-Royce only.

(2) AE 3007C Series Maintenance Manual (MM), CSP34012.

M. Other Publications Affected:

(1) AE 3007C Series Maintenance Manual (MM), CSP34012.

N. Prerequisites -- None

O. Corequisites -- None

2. ACCOMPLISHMENT INSTRUCTIONS

None

3. MATERIAL INFORMATION:

A. Configuration Chart -- Not applicable

B. Consumable Materials -- None

C. Expendable Parts -- None

CUSTOMER SUPPORT

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